Artificially recharging groundwater with lake water can affect water quality. Researchers tested different ways to treat lake water before recharging it. They found that using a combination of chemical flocculation and sand filtration improved water quality by reducing harmful substances like cyanobacteria and microcystin-LR. This treatment also removed more total phosphorus and organic matter, making the water safer to drink. The study shows that effective pre-treatment can lead to a more stable water quality system with lower risks of toxins and pollutants, which is important for managing drinking water quality in the face of climate change.